Boiler-tube fastener.



No. 804,590. PATENTE!) NOV. 14C, 1905. A. J. ERVIN @L J. R. WALKER.

BOILER TUBE PASTENER.

APPLICATION FILED MAR. 6, 1905.

LE-lmiunlmhllull A TTOHN S srATEs'PATnNT ibn.

ARTHUR JIMASON ERVIN AND JAMES RAYMOND WALKER, OF SOUTH CUMBERLAND,MARYLAND.

BONER-TUBE FASTENIEH..

ivo. 804,590.

Specification of Letters Patent.

Patented Nov. 14, 1905 Application filed March 6,1905. Serial No.248,477.

T0 all 'll/tem llt 711/01/ 0071/013777,.-

Be it known that we, ARTHUR J IMAsoN ER VIN and JAMES RAYMOND WALKER,citizens of the United States, and residents of South Uumberland, in thecounty of Allegany and State of Maryland, have invented a new and 1m*proved Boiler-Tube Fastener, of which the following is a full, clear,andexact description.

Our invention relates to means for fastening the tubes or ilues ofboilers to the tubesheets,having for its principal objects the provisionof a simple and secure fastening device.

With these and other objects in view, which will hereinafter appear, ourinvention consists in the various features which will now be describedand more particularly claimed.

Reference is to be had to the accompanying` drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a broken central vertical longitudinal section througha tubeand the coperating tube-sheets secured together by one forni of ourinvention. Fig'. 2 is an end elevation looking from the left in Fig'. 1.Fig. 3 is a side elevation of the nipple, and Figs. 4L and 5 arerespectively side and edge elevations of the gasket.

10 designates the tube-sheet at the furnace end of the boiler and 11that opposite. These are provided with the usual alined openings 12which may be of equal diameter and are cylindrical, so that the sheetsmay be weakened as little as possible. Through the opening in the sheet1l extends a tube 13, which is provided with a rolled end or enlargement14, the inner side of which contacts with the outside of the sheet.Through the opposite opening' extends a nipple 15, formed of a sectionof the tube, or at least being of the same diameter, this nipple alsohaving a rolled enlargement or head 16 located outside the sheet 10,with its inner surface contacting with said sheet over a considerablearea, as does the enlargement 14:. The tube is threaded at its end 17,and the nipple has an adjacent and oppositely-inclined thread 18, whichextends back suliistantially tothe tube-sheet. These threads are unitedby a similarlythreaded sleeve 19, the end 19u of which may coact withthe inner side of the sheet 10, thereA being, however, preferably,interposed a gasket 20, which may be of copper or other suitablematerial. The

head 16 may be provided with flattened engaging surfaces, which are hereshown as slots 21, adapted to receive a wrench. The rolled ends of boththe tube and nipple may be formed hot in the process of manufacture.

In assembling the parts the tube is inserted through the opening in thesheet 11 until its head contacts therewith. The sleeve is then screwedupon the thread 17 and the nipple inserted through the opening in theopposite sheet, the gasket being slipped about it. The sleeve is nowbrought into coaction with the thread 18 and the nipple turned by theengagement of a suitable tool with its slots 21 to force the end 19L ofthe sleeve against the gasket, which in turn presses said gasket againstthe sheet and the under side of the head 16 against the outside of thesheet, thus forming a steam-tight joint at both surfaces. The turning ofthe nipple at the same time draws the opposite head 14 against theoutside of the sheet 11 and also produces here a tight joint. Thearrangement of the parts is such that their contraction preventsleakage, but without the introduction of injurious stress. if by anychance a leak occurs, it may be readily remedied by a further turning ofthe nipple.

It will be seen that with this fastening it is unnecessary to make anychange in the tubesheets as ordinarily arranged and that the same tubesmay also be used, it being' only necessary to furnish the separatesection or nipple. The flues are made complete ready 'to install, andthe necessity of rolling the ends cold (a process which reduces thestrength ofthe metal) is eliminated. Each tube acts as a stay, drawingthe opposite sheets toward one another and preventing the loosening ofthe tubes, which so frequently occurs with the ordinary rolled-end type.W hen these tubes are used as flues, (which is the customary practice,)the threading upon all the elements and the gasket are upon the waterside of the sheet and are protected from flame, thus avoiding undueexpansion and contraction. It should be further noted that either end ofthe fiue may be removed separately without interfering with the otherparts.

As thechief liability to leakage occurs at the furnace or ire-box end,our improvedv fastening has been illustrated upon this portion only; butit will be obvious that, if it is desired, it may be applied to eitheror both ends.

Having thus described our invention, we

IOO

both threads and moving into copeiation I with the tube-sheet receivingthe nipple upon i making up the joint, and a gasket contacting I5 withthe sleeve and said sheet. ln testimony whereof We have signed our namesto this specification in the presence of two subscribing Witnesses.

ARTHUR JIMASON ERVIN. J AMES RAYMOND VALKER. l/Vitnesses:

J. J. STAPLETON, J oHnT B. PITZER.

